CN111302672A - Processing raw material of fused magnesia and preparation method thereof - Google Patents
Processing raw material of fused magnesia and preparation method thereof Download PDFInfo
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- CN111302672A CN111302672A CN202010285839.XA CN202010285839A CN111302672A CN 111302672 A CN111302672 A CN 111302672A CN 202010285839 A CN202010285839 A CN 202010285839A CN 111302672 A CN111302672 A CN 111302672A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
Abstract
A processing raw material of fused magnesia and a preparation method thereof comprise the following raw materials in parts by weight: 40-50 parts of flotation powder with the particle size of less than or equal to 2mm, 20-30 parts of magnesite powder with the particle size of less than or equal to 15mm, 20-30 parts of electric fused magnesium smelting auxiliary material with the particle size of less than or equal to 10mm, 10-15 parts of light-burned magnesia powder with the particle size of less than or equal to 1mm and 10-15 parts of water. Compared with the prior art, the invention has the beneficial effects that: the invention can effectively improve the balling rate and the strength of finished balls without adding a chemical bonding agent, and avoids the problems of production cost increased by adding the chemical bonding agent and environmental pollution caused by the bonding agent in the smelting process of fused magnesia. In addition, the invention solves the problem that the no-load operation of the mixing materials is caused by the mismatching of the mixing time and the pressing time in the ball pressing process, so that the power is wasted when the compacting machine and the ball pressing machine wait for the mixed materials.
Description
Technical Field
The invention relates to the technical field of refractory material production, in particular to a processing raw material of fused magnesia and a preparation method thereof.
Background
At present, due to the resource integration of magnesite mines in China, mine areas are required to be mined reasonably and orderly in repairability, and white garbage generated in early mining, namely low-grade magnesite, is subjected to secondary utilization. The flotation powder produced by using the low-grade magnesite is used as one of raw materials in most electric smelting magnesite processing industries. The main equipment for processing the fused magnesia raw material consists of electric equipment such as a mixing mill, a conveying belt, a compacting machine, a ball press, a vibrating screen and the like. The flotation mineral powder, light-burned magnesium powder, an electric-melted magnesium smelting auxiliary material (a back-burned material) and a binding agent are used as main raw materials, mixed, rolled into 40-60mm round magnesium balls (which may be square bodies according to the shape of a ball pressing mold), dried and stored for later use.
The particle sizes of the floating powder of the pressing ball raw material and the light-burned magnesium powder are all between 0 and 2mm, so that the problems of very low balling rate, low strength of finished balls and the like are caused. In order to improve the yield and the strength of finished magnesium balls, a chemical bonding agent with high manufacturing cost needs to be added in the production process, on one hand, the raw material input cost of the bonding agent is increased, and on the other hand, the finished magnesium balls added with the bonding agent can generate a part of harmful gas with peculiar smell in the melting process of the electrically-fused magnesium, thereby polluting the environment.
In addition, from the mixing and stirring of the ball pressing raw materials to the ball pressing, the raw materials are mixed, stirred and rolled for 30-40 minutes each time by a mixing and rolling machine, then the raw materials enter a double-roller compacting machine through a conveyer belt to be pressed into blocks with the thickness of 0-20mm, then the raw materials enter a double-roller compacting machine through the conveyer belt to be pressed into balls with the thickness of 40-60mm, and finally the finished magnesium balls are obtained after the raw materials are sieved by a vibrating screen. The mixed and evenly stirred materials are subjected to the whole process of twice pressing for about 10 minutes, and then are mixed and rolled again. In the whole process, because the mixing time is not matched with the pressing equipment, the conveyer belt, the compacting machine and the ball press machine run in no-load mode, or a special person is arranged in front of each equipment and manually opened or closed. The process operation is complicated, needs more than the skilled worker 3 to cause the waste of electric energy and the increase of labor cost like this.
Disclosure of Invention
The invention aims to provide a processing raw material of fused magnesite and a preparation method thereof, which can effectively improve the balling rate and the strength of finished balls without adding a chemical bonding agent, and avoid the problems of production cost increased by adding the chemical bonding agent and environmental pollution caused by the bonding agent in the smelting process of the fused magnesite. In addition, the invention solves the problem that the no-load operation of the mixing materials is caused by the mismatching of the mixing time and the pressing time in the ball pressing process, so that the power is wasted when the compacting machine and the ball pressing machine wait for the mixed materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
a processing raw material of fused magnesia comprises the following raw materials in parts by weight: 40-50 parts of flotation powder with the particle size of less than or equal to 2mm, 20-30 parts of magnesite powder with the particle size of less than or equal to 15mm, 20-30 parts of electric fused magnesium smelting auxiliary material with the particle size of less than or equal to 10mm, 10-15 parts of light-burned magnesia powder with the particle size of less than or equal to 1mm and 10-15 parts of water.
A preparation method of a processing raw material of fused magnesite comprises the following steps:
1) firstly, putting 40-50 parts of flotation powder, 20-30 parts of magnesite powder and 20-30 parts of electric fused magnesium smelting auxiliary materials into a mixing mill for mixing and rolling for 8-15 minutes, wherein the temperature of the mixed and rolled materials is 30-40 ℃;
2) adding light-burned magnesia powder, and rolling for 18-22 minutes at the temperature of 50-60 ℃;
3) adding water, mixing and grinding for 5-10 minutes, discharging materials to a compaction feeding conveyer belt, wherein the temperature of the mixed and ground materials is above 80 ℃;
4) the PLC power supply and the frequency converter are in linkage control to operate, the mixing mill discharges materials to the compacting feeding conveyer belt, the operating current of the compacting feeding conveyer belt is converted from no-load current to load current, the compacting machine starts to operate at the moment, and the materials are sent to the compacting machine to be pressed into blocks with the particle size of less than or equal to 20 mm;
5) the compacting machine discharges the blocky materials to a ball pressing and feeding conveyer belt, the running current of the ball pressing and feeding conveyer belt is converted from no-load current to load current, the ball pressing machine is started to run at the moment, the materials are sent to the ball pressing machine to be pressed into magnesium balls with the size of 40-60mm, and the magnesium balls are sieved out to obtain finished magnesium ball raw materials;
6) the compacting machine and the ball press machine are automatically stopped after finishing discharging.
In the step 4), the power of the compacting feeding conveyer belt is 5.5-7.5kw, the no-load current of the compacting feeding conveyer belt is 4-6A, and the load current of the compacting feeding conveyer belt is 10-14A.
The power of the press ball feeding conveyer belt in the step 5) is 5.5-7.5kw, the no-load current of the press ball feeding conveyer belt is 4-6A, and the load current of the press ball feeding conveyer belt is 10-14A.
Compared with the prior art, the invention has the beneficial effects that:
1) the added particle size material reduces the rejection coefficient of magnesium molecules and improves the yield. When mixing and grinding, different batching orders are matched with different stirring temperature sections, so that the activity of the light-burned magnesia powder is good, the light-burned magnesia powder is easy to combine, and the strength of the finished ball is increased. The invention is more environment-friendly without adding chemical bonding agent.
2) The invention utilizes the PLC power supply and the frequency converter to control the equipment to operate in a linkage way. The device has high utilization rate, simple operation, electric energy saving of more than 30 percent and low investment cost.
3) The invention replaces manpower with electronic products, saves more than 2 workers in each production line, saves labor cost for factories, reduces post workers and reduces safety accident coefficient of operators.
4) The invention is energy-saving, environment-friendly and efficient, and can be widely popularized and applied in the fused magnesia industry.
Drawings
FIG. 1 is a flow chart of the production process of the present invention.
FIG. 2 is an electrical schematic diagram of the operation of the PLC power supply and frequency converter linkage control device of the present invention.
In the figure: 1-mixing mill, 2-compacting feeding conveyer belt, 3-compacting machine, 4-ball-compacting feeding conveyer belt, 5-ball-compacting machine, 6-finished product output conveyer belt, 7-finished product magnesium balls and 8-ball-discharging vibrating screen.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
referring to fig. 1, a processing raw material of fused magnesia comprises the following raw materials in parts by weight: 40-50 parts of flotation powder with the particle size of less than or equal to 2mm, 20-30 parts of magnesite powder with the particle size of less than or equal to 15mm, 20-30 parts of electric fused magnesium smelting auxiliary material with the particle size of less than or equal to 10mm, 10-15 parts of light-burned magnesia powder with the particle size of less than or equal to 1mm and 10-15 parts of water.
Magnesite powder with the particle size less than or equal to 15mm is produced by mine mining and screening.
The melting auxiliary material of the electric melting magnesium with the grain diameter less than or equal to 10mm is a burn-back material, which is an incomplete lack material in the melting process of the electric melting magnesia. .
A preparation method of a processing raw material of fused magnesite comprises the following steps:
1) firstly, putting 40-50 parts of flotation powder, 20-30 parts of magnesite powder and 20-30 parts of electric fused magnesium smelting auxiliary materials into a mixing mill for mixing and rolling for 8-15 minutes, wherein the temperature of the mixed and rolled materials is 30-40 ℃;
2) adding light-burned magnesia powder, and rolling for 18-22 minutes at the temperature of 50-60 ℃;
3) adding water, mixing and grinding for 5-10 minutes, discharging materials to a compaction feeding conveyer belt, wherein the temperature of the mixed and ground materials is above 80 ℃;
4) the PLC power supply and the frequency converter are in linkage control to operate, the mixing mill discharges materials to the compacting feeding conveyer belt, the operating current of the compacting feeding conveyer belt is converted from no-load current to load current, the compacting machine starts to operate at the moment, and the materials are sent to the compacting machine to be pressed into blocks with the particle size of less than or equal to 20 mm;
5) the compacting machine discharges the blocky materials to a ball pressing and feeding conveyer belt, the running current of the ball pressing and feeding conveyer belt is converted from no-load current to load current, the ball pressing machine is started to run at the moment, the materials are sent to the ball pressing machine to be pressed into magnesium balls with the size of 40-60mm, and the magnesium balls are sieved out to obtain finished magnesium ball raw materials;
6) the compacting machine and the ball press machine are automatically stopped after finishing discharging.
In the step 4), the power of the compacting feeding conveyer belt is 5.5-7.5kw, the no-load current of the compacting feeding conveyer belt is 4-6A, and the load current of the compacting feeding conveyer belt is 10-14A.
The power of the press ball feeding conveyer belt in the step 5) is 5.5-7.5kw, the no-load current of the press ball feeding conveyer belt is 4-6A, and the load current of the press ball feeding conveyer belt is 10-14A.
The added magnesite powder has the grain diameter of about 15mm, and serves as a skeleton component in the rolling process to play a supporting role, so that the strength of the finished magnesium ball is improved; in addition, 10-15 parts of light-burned magnesia powder is mixed with the mixed material and mixed with other materials for grinding at the temperature of 50-80 ℃, magnesium molecules in the light-burned magnesia powder are more active at the temperature, the overall viscosity of the mixed material is increased, the mixed material is easier to combine in the grinding process, and the yield is effectively ensured.
The electrical principle of the PLC power supply and frequency converter linkage control is shown in figure 2, the PLC sets the no-load current value and the load current value of a compaction feeding conveyer belt and a ball pressing feeding conveyer belt, the compaction feeding conveyer belt and the ball pressing feeding conveyer belt switch to operate in the no-load state and the load state, when the mixing mill discharges materials and the compaction feeding conveyer belt is worn and loaded, the compaction feeding conveyer belt is converted from the no-load current value to the load current value, and at the moment, the compactor is controlled to be started by the frequency converter (the triggering condition for starting the compactor is the load current value of the compaction feeding conveyer belt set by the PLC); when the compacting machine discharges materials and the ball pressing and feeding conveyer belt is worn to load, the no-load current value of the ball pressing and feeding conveyer belt is converted into a load current value, and at the moment, the ball pressing machine is controlled to be started by a frequency converter (the triggering condition for starting the ball pressing machine is the load current value of the ball pressing and feeding conveyer belt set by the PLC); and after the pressing operation is finished, the compacting machine and the ball press are automatically closed. Through the electrical control, the problem that the power is wasted when the compacting machine and the ball press wait for no-load operation of the mixing materials due to the fact that the mixing time of the mixing machine is not matched with the pressing time of the compacting machine and the ball press can be avoided. The equipment has simple technological operation process, the whole set of procedures can be completed by 1 person, and the requirement on the skill of an operator is not high.
Example 1
A processing raw material of fused magnesia comprises the following raw materials in parts by weight: 45 parts of flotation powder with the grain diameter less than or equal to 2mm, 25 parts of magnesite powder with the grain diameter of 14mm, 25 parts of electric fused magnesium smelting auxiliary material with the grain diameter of 9mm, 12 parts of light-burned magnesia powder with the grain diameter less than or equal to 1mm and 12 parts of water.
A preparation method of a processing raw material of fused magnesite comprises the following steps:
1) firstly, putting flotation powder, magnesite powder and an electrically fused magnesium smelting auxiliary material into a mixing mill for mixing and rolling for 10 minutes, wherein the temperature of the mixed and rolled material is 30-32 ℃;
2) adding light-burned magnesia powder and rolling for 20 minutes, wherein the temperature of the mixed and rolled materials is 50-55 ℃;
3) adding water, mixing and grinding for 5-10 minutes, discharging materials to a compaction feeding conveyer belt, wherein the temperature of the mixed and ground materials is above 80 ℃;
4) the PLC power supply and the frequency converter are in linkage control to operate, the mixing mill discharges materials to the compacting feeding conveyer belt, the running current of the compacting feeding conveyer belt is converted from no-load current to load current, the compacting machine starts to operate at the moment, and the materials are sent to the compacting machine to be pressed into blocks with the particle size of 20 mm;
the power of the compacting feeding conveyer belt is 7.5KW, the no-load current of the compacting feeding conveyer belt is 4-6A, and the load current of the compacting feeding conveyer belt is 10-14A;
5) the compacting machine discharges the blocky materials to a ball pressing and feeding conveyer belt, the running current of the ball pressing and feeding conveyer belt is converted from no-load current to load current, the ball pressing machine is started to run at the moment, the materials are sent to the ball pressing machine to be pressed into magnesium balls with the size of 40-60mm, and the magnesium balls are sieved out to obtain finished magnesium ball raw materials;
the power of the ball pressing and feeding conveyer belt is 7.5KW, the no-load current of the ball pressing and feeding conveyer belt is 4-6A, and the load current of the ball pressing and feeding conveyer belt is 10-14A;
6) the compacting machine and the ball press machine are automatically stopped after finishing discharging.
Example 2
A processing raw material of fused magnesia comprises the following raw materials in parts by weight: 42 parts of flotation powder with the grain diameter less than or equal to 2mm, 22 parts of magnesite powder with the grain diameter of 13mm, 22 parts of electric fused magnesium smelting auxiliary material with the grain diameter of 8mm, 11 parts of light-burned magnesia powder with the grain diameter less than or equal to 1mm and 11 parts of water.
The method for preparing the raw material for processing fused magnesite in this example is the same as in example 1.
Example 3
A processing raw material of fused magnesia comprises the following raw materials in parts by weight: 48 parts of flotation powder with the grain diameter less than or equal to 2mm, 28 parts of magnesite powder with the grain diameter of 14.5mm, 28 parts of fused magnesium smelting auxiliary material with the grain diameter of 8.5mm, 14 parts of light-burned magnesia powder with the grain diameter less than or equal to 1mm and 14 parts of water.
The method for preparing the raw material for processing fused magnesite in this example is the same as in example 1.
Claims (4)
1. The processing raw material of the fused magnesia is characterized by comprising the following raw materials in parts by weight: 40-50 parts of flotation powder with the particle size of less than or equal to 2mm, 20-30 parts of magnesite powder with the particle size of less than or equal to 15mm, 20-30 parts of electric fused magnesium smelting auxiliary material with the particle size of less than or equal to 10mm, 10-15 parts of light-burned magnesia powder with the particle size of less than or equal to 1mm and 10-15 parts of water.
2. A method for preparing a processing raw material for fused magnesite according to claim 1, comprising the steps of:
1) firstly, putting 40-50 parts of flotation powder, 20-30 parts of magnesite powder and 20-30 parts of electric fused magnesium smelting auxiliary materials into a mixing mill for mixing and rolling for 8-15 minutes, wherein the temperature of the mixed and rolled materials is 30-40 ℃;
2) adding light-burned magnesia powder, and rolling for 18-22 minutes at the temperature of 50-60 ℃;
3) adding water, mixing and grinding for 5-10 minutes, discharging materials to a compaction feeding conveyer belt, wherein the temperature of the mixed and ground materials is above 80 ℃;
4) the PLC power supply and the frequency converter are in linkage control to operate, the mixing mill discharges materials to the compacting feeding conveyer belt, the operating current of the compacting feeding conveyer belt is converted from no-load current to load current, the compacting machine starts to operate at the moment, and the materials are sent to the compacting machine to be pressed into blocks with the particle size of less than or equal to 20 mm;
5) the compacting machine discharges the blocky materials to a ball pressing and feeding conveyer belt, the running current of the ball pressing and feeding conveyer belt is converted from no-load current to load current, the ball pressing machine is started to run at the moment, the materials are sent to the ball pressing machine to be pressed into magnesium balls with the size of 40-60mm, and the magnesium balls are sieved out to obtain finished magnesium ball raw materials;
6) the compacting machine and the ball press machine are automatically stopped after finishing discharging.
3. The method for preparing a processing raw material of fused magnesite according to claim 2, wherein the power of the compacting feeding conveyor belt in step 4) is 5.5-7.5kw, the no-load current of the compacting feeding conveyor belt is 4-6A, and the load current of the compacting feeding conveyor belt is 10-14A.
4. The method for preparing a processing raw material of fused magnesite according to claim 2, wherein the power of the ball-pressing feeding conveyer belt in step 5) is 5.5-7.5kw, the no-load current of the ball-pressing feeding conveyer belt is 4-6A, and the load current of the ball-pressing feeding conveyer belt is 10-14A.
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